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INSTRUCTION SET S3C84E5/C84E9/P84E9
6-52
LDC/LDE — Load Memory
LDC dst,src
LDE dst,src
Operation: dst ← src
This instruction loads a byte from program or data memory into a working register or vice-versa. The
source values are unaffected. LDC refers to program memory and LDE to data memory. The
assembler makes "Irr" or "rr" values an even number for program memory and an odd number for
data memory.
Flags: No flags are affected.
Format:
Bytes Cycles Opcode
(Hex)
Addr Mode
dst src
1. opc dst | src
2 10 C3 r Irr
2. opc src | dst 2 10 D3 Irr r
3. opc dst | src XS 3 12 E7 r XS [rr]
4. opc src | dst XS 3 12 F7 XS [rr] r
5. opc dst | src XL
L
XL
H
4 14 A7 r XL [rr]
6. opc src | dst XL
L
XL
H
4 14 B7 XL [rr] r
7. opc dst | 0000
DA
L
DA
H
4 14 A7 r DA
8. opc src | 0000
DA
L
DA
H
4 14 B7 DA r
9. opc dst | 0001
DA
L
DA
H
4 14 A7 r DA
10. opc src | 0001
DA
L
DA
H
4 14 B7 DA r
NOTES:
1. The source (src) or the working register pair [rr] for formats 5 and 6 cannot use the register pair 0–1.
2. For the formats 3 and 4, the destination "XS [rr]" and the source address "XS [rr]" are both one byte.
3. For the formats 5 and 6, the destination "XL [rr] and the source address "XL [rr]" are both two bytes.
4. The DA and the r source values for the formats 7 and 8 are used to address program memory. The second set of
values, used in the formats 9 and 10, are used to address data memory.
5. LDE instruction can be used to read/write the data of 64-Kbyte data memory.